Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d726ba9f4627e3…

MALICIOUS

PDF

83.8 KB Created: 2021-08-12 05:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6e78650ba467cec2137e1966fc238d2 SHA-1: 1296ad3e711d331d0575c92fd96f8278a8a3e166 SHA-256: 84d726ba9f4627e3aaded1cbc364e24229c689dd2b6d37f5526b26981c8f3900
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/01000034bb0a98372417ac8759f382f6/zixofupozuxuwibelo.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d30b99db976644c35ef0bd56c55c7319/66270340278.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/nopigariselurugabepusuvi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ecee043db15782e402dd3cb779ea0133/wixagusevupimevetix.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/rogulafulifevemakutekamo.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/xatep.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/94862645478.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/2381732894.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/4869899140.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/wukolagujisepagiboro.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/lesowaferenawusepifixef.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/82859766111.pdfIn PDF document text
    • http://ping-property.com/user_img/files/37656039588.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/41651837538.pdfIn PDF document text
    • http://teakdeck.pl/files/file/1129780629.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/97fb0feff8a38a32538a62d828e3b83b/nafilajudujojagawirixitu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/22376671336.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/99155426725.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e8f052980d30bdb68b01a301e2648dd1/27574505517.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092161b2809d---binel.pdfIn PDF document text
    • http://aimic.com/userfiles/file/77675475371.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe25502b5c---rafexipasekebodekika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=macroeconomia+version+para+america+latina+gregory+mankiw+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 20580 bytes
SHA-256: 3207d7f848f59420b9ccf5b08b3349b699913aa6f8960e61a63605d8b2ae37be
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 11316 bytes
SHA-256: 12d4704aa7630faa31d1f0ed1b6afbabf38e20cd4d150e092cfadbed88415f79
font_02_sfnt_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1